Transmission Flashcards
0
Q
define the dedendum
A
-> distance between the pitch circle and root
1
Q
define addendum
A
-> distance between the pitch circle and the crest
2
Q
define spur gear
A
- > cheap
- > common
- > external and internal
3
Q
define bevel gear
A
- > change axis of rotation through 90 degrees
- > straight teeth
- > spiral teeth
- > Fairly slow rotation
4
Q
define helicoil gear
A
- > tranmits power at any angle
- > used at +3600RPM
- > single
- > double
- > skew - 90 degrees axis change
5
Q
define worm gear
A
- > speed reduction
- > non-parallel , non-intersecting gears
- > needs lub
6
Q
Define conformed gear
A
- > used in helicopters
- > has a wasted root
- > can take higher loads
7
Q
what is meant by compound gear train
A
-> shaft with more than one gear attached
8
Q
define epicyclic reduction gear
A
- > moon and planet gearing
- > used for speed reduction
9
Q
what does a bi-polar block do (chains)
A
-> changes chain bend angle by 90 degrees
10
Q
Define ball screw jack
A
- > converts rotary motion into linear motion
- > high speeds
- > used in stabiliser drives
11
Q
what is the effect of more strands or wires in a cable
A
-> greater flexibility
12
Q
define cable construction
A
- > given by a two number ident
- > e.g. 1x7
- > first number identifies amount of strands
- > second number identifies amount of wires within one strand
13
Q
Define lockclad
A
- > normal control wires
- > surrounded by swaged aluminium tube
- > lowers creep stretch and helps sealing
- > dampens the vibrations of the cables
- > gives higher co-efficiant of thermal expansion
14
Q
how is the lock pin location identified on a turnbuckle
A
-> vee cut out
15
Q
Define a teleflex control cable
A
- > high tensile core
- > compression windings (wound opposite direction)
- > spacing wires (wound opposite direction again) - provides seating for helix wires
- > helix wires - push pull wires (wound in opposite direction again)
16
Q
define bowdenflex cables
A
- > cable designed to bend
- > uses ball bearings
